precision mediump float;

varying vec2 vTextureCoord; //接收从顶点着色器过来的参数
uniform sampler2D sTexture;//纹理内容数据

void main() {
    //给此片元从纹理中采样出颜色值
    //gl_FragColor = texture2D(sTexture, vTextureCoord);
     gl_FragColor = vec4(0.0,1.0,0.0,1.0);
}